"The Iron Garage" in Stony Plain Alberta did my supercharger install and looked after doing my rims at a custom paint shop in Edmonton Alberta. The Process takes about a week to do from the time you get your rims to the shop untill you put them back on your ride. Kinda hard to tell but the rims are actually "Brillant Black Crystal Pearl" color matched then clear coated. I had bought the center caps from Billet Technology( a rear pain the a_ _ to install about 40 washers and hold screws)
I would check local custom shops in your area if you want something similiar done..should be able to do no problem. I have seen others do theirs in flat black and that looked good as well.